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Chemical Engineering - Polymer Technology

Exercise : Polymer Technology - Section 4
31.
Vulcanisation of rubber
decreases its tensile strength.
increases its ozone & oxygen reactivity.
increases its oil & solvent resistance.
converts its plasticity into elasticity.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
Teflon is
phenol formaldehyde
an inorganic polymer
polytetra florouethylene (PTFE)
a monomer
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
__________ is produced by polymerisation of chloroprene.
Thiokol (a polysulphide rubber)
Butyl rubber
Neoprene
Polyurathane rubber
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
Polyvinyl chloride (PVC) is
a thermosetting material.
a condensation polymerisation product.
made by employing emulsion polymerisation.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Pick out the wrong statement regarding the solubility characteristics of high polymers.
Greater the degree of cross-linking in the polymer, lesser is its solubility.
Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents.
Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent.
High molecul ar weight polymers on dissolving gives solution of very low viscosity.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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